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Metal Weights Calculating

Web Machinist Version 5.0 Now Available! Just added, Materials Weights Calculator! Choose from 13 Metal Types and many more Alloy’s! It can calculate the weight of Round Stock, Rectangular Stock, Square Stock and even Hex Stock! Material Weights Calculator will even calculate the material cost if you want. ( See Below )

How to calculate how much a piece of metal weighs? On occasion as a machinist or machine shop owner or job estimator you may need to calculate the weight of a piece or pieces of metal to calculate the cost of the metal as part of the job quoting process. Obviously this can be easily done by looking at a web site that has a calculator built into it, if you trust it that is. Or you can thumb through pages of a metal supplier’s catalog or call and wait on hold for a representative to help you.

Another alternative is to calculate the weight yourself as explained below:

Calculating the Weight of Round Shaped Metal:

Diameter of Metal x Diameter of Metal x “Variable” x .7854 x Length of Material in Inches = Weight of Metal in Pounds

Note: the “Variable” is a Calculation Factor Unique to the Metal and Alloy. For instance the “Variable” for 6061 Aluminum is “.098” and the “Variable” for 7075 Aluminum is “.101”

Example: We want to calculate the weight of a 12’ (144”) piece of 2.0” Diameter 6061 Aluminum.

2.0 X 2.0 = 4

4 x Variable .098 = .392

.392 x .7854 = .3078768

.3078768 x 144 = 44.3342592 Pounds

Round it to 44.33 Pounds

Calculating the Weight of Rectangle and Square Shaped Metal:

Width of Metal x Height of Metal x “Variable” x Length of Material in Inches = Weight of Metal in Pounds

Note: the “Variable” is a Calculation Factor Unique to the Metal and Alloy. For instance the “Variable” for 6061 Aluminum is “.098” and the “Variable” for 7075 Aluminum is “.101”

Example: We want to calculate the weight of a 12’ (144”) piece of 1.0” x 2.0” 7075 Aluminum Rectangle Bar.

1.0 X 2.0 = 2

2 x Variable .101 = .202

.202 x 144 = 29.088 Pounds

Round it to 29.09 Pounds

Calculating the Weight of Hexagon Shaped Metal:

((Hex Size of Metal ÷ 2) x 1.155)² x 2.598 x “Variable” x Length of Material in Inches = Weight of Metal in Pounds

Note: the “Variable” is a Calculation Factor Unique to the Metal and Alloy. For instance the “Variable” for 6061 Aluminum is “.098” and the “Variable” for 7075 Aluminum is “.101”

Example: We want to calculate the weight of a 12’ (144”) piece of 3.0” 7075 Aluminum Hexagon Bar.

3.0 ÷ 2 = 1.5

1.5 x 1.155 = 1.7325

1.7325² = 3.00155625

3.00155625 x 2.598 = 7.798043138

7.798043138 x Variable .101 = .787602357

.787602357 x 144 = 113.4147394 Pounds

Round it to 113.41 Pounds

Some Variables that can be used in the above formulas are listed below:

Metal:

Aluminum 6061

Aluminum 7075

Alloy Steel 4130

Brass 360

Stainless 303

Stainless 316

Titanium

“Variable”:

.098

.101

.282

.307

.287

.286

.163

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